The FBI has been called in to help investigate a multi-million dollar arson case involving the Dakota Access Pipeline here in Northwest Iowa.

Earlier this month, someone set fire to machinery and excavators being used on pipeline work near Newell in Buena Vista County.

Damage is estimated to be around $2.5 million dollars. No arrests have been made and the FBI is trying to determine if this case is linked to other arsons occurring at pipeline construction sites in the region.

The 1,170-mile Dakota Access Pipeline has drawn the most protests in North Dakota where the Standing Rock Sioux and other Native American tribes say the pipeline could pollute the Missouri River damaging cultural lands and tribal burial grounds.

It’s being reported that 2,000 veterans will join North Dakota protestors next week for a nonviolent intervention.

Protests have also surfaced in central Iowa where a short lived hunger strike was staged in Des Moines.